I’m Going To Court Against A “sovereign Citizen”, Anything I Should Know?

To give some context, I’ve never been to court, but back in December of 2022 I was in an accident in a work vehicle. The person who T-Boned me was unlicensed, uninsured, and switched seats with the passenger. The moment they got out of the vehicle it REEKED of weed. Fast forward May 11th of this year and I was told I need to testify against him as a witness since I was driving. It was scheduled for June 7th but I called today to verify the time and they told me it was moved until September because he has decided to represent himself and believes that “he doesn’t abide by Canada Laws”.
My question i guess is, what is expected of me when I go and what will the process be?
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